This function is compatible with the following targets:
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#include <math.h>
double atan2(double y, double x);
float atan2f(float, float);
long double atan2l(long double, long double);Parameters:
Parameters for this function are:
This function computes the value of the tangent of x/y using the sines of both arguments. See "Example of acos(), asin(), atan(), atan2() usage." for example usage.
A domain error occurs if both x and y are zero.
Return:
The function atan2() returns the arc tangent of y/x in the range
, ++ radians.#include <math.h>
#include <stdio.h>
int main(void)
{
double x = 0.5, y = -1.0;
printf("arccos (%f) = %f\n", x, acos(x));
printf("arcsin (%f) = %f\n", x, asin(x));
printf("arctan (%f) = %f\n", x, atan(x));
printf("arctan (%f / %f) = %f\n", y, x, atan2(y, x));
return 0;
}
Output:
arccos (0.500000) = 1.047198
arcsin (0.500000) = 0.523599
arctan (0.500000) = 0.463648
arctan (-1.000000 / 0.500000) = -1.107149
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Last updated: August 16, 2000